Polymastiidae and Suberitidae (Porifera: Demospongiae: Hadromerida) of the deep Weddell Sea, Antarctic * Author Plotkin, Alexander S. Author Janussen, Dorte text Zootaxa 2008 1866 95 135 journal article 10.5281/zenodo.183878 810a9086-292c-4ca4-8075-91312cfac96e 1175­5326 183878 Genus Suberites Nardo, 1833 Diagnosis (sensu van Soest 2002 ): Sponges are massive, compact, usually with velvety smooth surface, caused by dense ectosomal arrangement of tylostyles oriented perpendicularly to the sponge surface, pointing outward; peripheral choanosomal skeleton consists of closely packed strands of tylostyles distinctly larger than ectosomal ones, with interior skeleton of densely packed unordered tylostyles. Centrotylote, minutely spined microstrongyles may be present in a few species and if so are concentrated at the surface. Type species: Alcyonium domuncula Olivi, 1792 (by original designation).